CafeStation cannot connect with some of the workstations. What's wrong?

Replace workstation_name_or_IP with the Server address field value from Main/Connection page in program settings:

If ping command fails, it means that there is something wrong with
network setup. If other workstations are connected successfully, please verify that the TCP/IP protocol settings in LAN connection
properties are correct. Usually network is set to obtain an IP address
automatically, but if you're using static IP numbers, make sure that
the default gateway and subnet mask match settings on the computers
that connect properly.